Source : Webster's Revised Unabridged Dictionary (1913)

Salvo \Sal"vo\, n.; pl. {Salvos}. [L. salvo jure, literally, the
   right being reserved. See {Safe.}]
   An exception; a reservation; an excuse.

         They admit many salvos, cautions, and reservations.
                                                  --Eikon
                                                  Basilike.

Salvo \Sal"vo\, n. [F. salve a discharge of heavy cannon, a
   volley, L. salve hail, imperat. of salvere to be well, akin
   to salvus well. See {Safe}.]
   1. (Mil.) A concentrated fire from pieces of artillery, as in
      endeavoring to make a break in a fortification; a volley.

   2. A salute paid by a simultaneous, or nearly simultaneous,
      firing of a number of cannon.

Source : WordNet®

salvo
     n 1: an outburst resembling the discharge of firearms or the
          release of bombs
     2: rapid simultaneous discharge of firearms; "our fusillade
        from the left flank caught them by surprise" [syn: {fusillade},
         {volley}, {burst}]
     3: a sudden outburst of cheers; "there was a salvo of approval"
     [also: {salvoes} (pl)]